Overseaming sewing-machine.



A. GRIEB.

OVERSEAMING SEWING MACHINE.

APPLICATION FILED 0012,1914.

1,197,735. v PatentedSept. 12,1916.

2 SHEETS-SHEET I.

WITNESSES: mafia 4 73M BY ATTfi/itfi A. GRIEB.

OVERSEAMING sewmc MACHINE.

APPLICATION FILED OCT. 2. I914.

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ALFRED GRIEB, 0F ELIZABETH, NEW JERSEY, ASSIGNOR TO THE SINGER MANUFAC-TUBING COMPANY, A CORPORATION OF NEW JERSEY.

OVERSEAMING SEWING-MACHINE.

Specification of Letters Patent. Patented Sept. 12, 1916..

Application filed October 2, 1914. Serial No. 864,567.

To all whom it may concern:

Be it known that I, ALFRED GRIEB, a citizen of the United States,residing at Elizabeth, in the county of Union and State of New Jersey,have invented certain new and useful Improvements in OverseamingSewing-Machines, of which the following is a specification, referencebeing had therein to the accompanying drawings.

This'invention relates to improvements in sewing machines, and has forits object to provide a compact and efficient machine for overseaming orcross stitching, particularly adapted for securing wire binding uponhats and for purposes of like character.

In its present embodiment the machine employs stitch-forming mechanismadapted to manipulate a single thread, the needle-bar and looper beinggiven lateral movements at right angles to the movement of the feedsimultaneously with the action of the latter. The needle-bar is mountedto reciprocate in a swinging frame, and the looper is carried byaslidingsection of the main or driving shaft which is journaled inbearing supports rising from the bed-plate of the machine. Feedactuating and feedlift eccentrics are mounted upon the driving shaft,the shaft carrying also a gear which meshes with the gear of acam-wheel, the latter being employed to operate a segmentleveradjustably connected to a rocker having direct link connections with asleeve or bushing embracing the sliding looper-carrying section of thedriving shaft and with the swinging needle-bar frame. The feeddog iscarried by a feed-bar of usual construction, and feed ,actuating andfeed-lift rockers pivotally support said bar respectively at the rearand forward ends thereof. Parallel bearing supports risingfrom thebed-plate ail'ord supporting members common to both rockers; and therockers are operated from the driving shaft at a point intermediate saidbearing supports by two rcciprocatory members.

In the d awings, Figure 1, is a perspective view from the front of amachine embodying the improvements. Fig. 2 is a view in detail of thesectional driving and loopercarrying shaft, together with the sleevewhich embraces the sliding section thereof and supports thethroat-plate. Fig. 3 is a perspective view of the improvements from therear of the machine, the frame of the latter being indicated partly bydotted lines. Fig. 4 is a perspective view partly in section of thedriving shaft and the feed-lift mechanism connected therewith.

The machine comprises the bed-plate A, standard B and overhanging arm C.Rising from the bed-plate. are the bearing sup- 1 guide-arm (Z which isdisposed intermediate a boss on the head of the overhang ng arm and anoverhangingclip c secured thereon.

Mounted to reciprocate vertically within bearing apertures formed in theswinging frame 5 is a needle-bar 6 carrying the eyepointed needle 7.Clamped upon the needlebar by means of the screw 8 is the split hub 9 ofa short arm 10 pivotally connected at 11 to a link 12 carried at the endof the vibrating arm 13 which is fulcrumed at 14 upon the overhangingarm C and which is operatively connected 'by the pitman 15 with anactuating crank or eccentric upon the driving-shaft 2. The projectingbosses 0* on the head of the overhanging arm are provided with aperturesto receive the presserbar 16, the latter carrying the presser-foot 17and being provided with an arm 18 which receives the pressure of aflat-spring 19, the latter acting to lower the Presser-foot upon thematerial when the presser-bar is released by the lifting-lever 20.

As hereinbefore stated, the driving shaft 2 is sectional; its extremeend section 2 being formed with an axial aperture 21 to receive therearwardly projecting stud 22 of the looper 23, the looper being held inplace by means of a set-screw 2% which engages the fiat face of stud 22,thereby holding the same against both turning and endwise of section 2is formed with a transverse rib or lug 27 and with a stud 28, and therib and stud fit within a suitable apertured seat 29 formed in the endof section 2", the flattened face 28* of stud 28 being engaged by aclamp-screw 30 which serves to hold section 2 rigidly secured to section2 in such manner that the sleeve or bushing 25 is confined againstendwise movement relative to the shaft. The end of shaft section 2*opposite stud 28 is formed with a slot 31 to receive the reducedflattened or keyed end 32 of the main driving section of shaft 2. Itwill be seen that the construction thus described permits the rigidlyconnected sections 2" and 2 to mo ve endwise relatively to the mainsection 2simultaneously with their rotary movement with saidmain-section.

The sleeve or bushing 25 is provided with an aperture 33 in line withthe clampingscrew 24, so that the said screw may be loosened to permitremoval and replacement of the looper without removing the sleeve fromthe section 2". A second aperture 34 is formed in the sleeve 2 in linewith clamping-screw 30 inasmuch as the section 2 must be secured tosection 2 after the sleeve is in place.

From the foregoing it will be seen that the needle-bar and looper arecapable of bodily movements at right angles to the line of feed. Toproduce such movements, an actuating member common to both theneedle-bar and looper and capable of wide changes in the extent of itsoperative movements, isemployed. The said actuating member comprises atriple-armed rocker 35 formed ,with a hub to receive the studscrew 35which is held within the projecting boss I) of the standard B. Thedepending arm 36 of the rocker is pivotally connected by means of thestud-screw 37 to one end. of a link 38 having its opposite end aperturedto receive the stud-screw 39, the latter entering the threaded-aperture40 of a transverse lug 25 formed integrally with the sleeve 25 andpartially overhanging section 2 of the driving shaft. The lug 25* isformed with an apertured seat 41 to receive a narrow throat-plate 42,the latter being held in place by means of the screw 43. In practice,the throat-plate slides within a channel formed in the upper face ofbearing support 1*, the side walls of the channel holding the plateagainst lateral movement and thereby preventing oscillatory movement ofthe sleeve 25.

Tothe upwardly extending arm 36 of the rocker 35 is pivotally secured bymeans of the stud-screw 44, one end of a link 45 having its opposite endformed with a hub 46 to receive the shouldered adjusting bolt 47supporting at its end a T-shaped stud to fit within the correspondinglyformed groove 48 of a segment lever 49 fulcruined at 50 upon thestandard B and provided with a depending extension 51 carrying aroller-stud 52 fitted within the cam-groove 53 of the cam-wheel 54,mounted upon a stud s which has a shank 8' arranged eccentric theretoand held within a boss projecting from the standard B. By turning thestud 8 the distance between the camwheel and its driving gear may beadjusted to compensate for wear. The gear 54 of cam-wheel 54 meshes witha gear 55 on the driving shaft 2, whereby motion. is transmitted fromthe driving shaft to the segment lever 49 and, through the aforesaidrocker and link connections, to the sliding sections 2 and 2 of thedriving shaft and also to the swinging needle-bar frame in the mannernow to be described,

Projecting laterally from the frame 5 is a lug (50 supporting astud-screw 61' which is embraced by a transverse collar 62 atone end ofa link 63, the bent opposite end of the link being pivotally connectedat 64 to the upwardly extending rocker-arm 65. It will be noted that thefulcrum point 4 of the needle-bar frame is located below the connectingpoint 61, of the said frame and the link 63. Hence when the rocker-arm36 is swung toward the left or right to impart a lateral movement to thelooper, the reverse movement of rocker-arm 65 and, the upper portion ofthe needle-bar frame will move the needle laterally a correspondingdistance inaccord with the looper. By moving the end of link 45 towardand from the axis of movement of the segment lever 49 an adjustment willbe made in the lateral move ment of both the needle-oar and the looper,as will be understood without further explanation.

The shank. of the feed-dog 66 fits within a channel (57* formed in thefeed-bar 67, being rigidly secured to the bar by means of a fasteningscrew 66*. The opposite end of the feedbar is formed with a hub 68 whichfits upon the upper shaft 69 of a feed-actuating rocker 70. The rocker70 is disposed intermediate parallel bearing supports a and (1 risingfrom the bed-plate A and provided with bearing apertures to receive therock-- shaft 71 upon which the rocker 70 is mounted. An arm 72projecting upwardly from the rocker 70 is formed with a segmental slotto receive the stud-bolt 73 carried at one end of a feed-actuatingeccentric rod 74 provided with a strap 75 embracing an cecentric 76 on.the driving shaft 2.

The feed lifting mechanism comprises a rock-shaft 77 journaled in thebearing supports a and a and having securely clamped thereon by means ofscrew-7 8 the split and apertured end of a crank-arm 79 pivotallyconnected at 80 to the lower end of a link 81, the upper end of the linkbeing formed with rod 86, the strap 86* of the latter embracing I theeccentric 87 upon the driving shaft 2.

It will thus be seen that the feed-rockers operate above the bed-plate Aupon rockshafts mounted in bearing supports common to both, that theoperative connections between the rocker and the driving shaft aredisposed intermediatethe said bearing supports, and that the feed-bar issupported at its end adjacent the feed-dog by the feedlift rockermembers. This arrangement provides adequate supporting means for thefeed-bar and feed-rockers, relieving the latter from twist when heavypressure is imposed upon the feed-dog, and protecting the actuatingpitmen and eccentrics from undue wear.

It will be understood that various changes may be made in the embodimentof the imlooper, an axially movable looper shaft and a supportingbushing adapted to slide therewith, a throat-plate carried by saidbushing and mounted in the frame to hold the bushing against oscillatorymovement, a rocking element, and link connections between said rockingelement, the needle-bar frame and the bushing.

2. In a sewing machine, the combination with a frame including asupporting arm, of a swinging needle-bar frame formed with a lateralhub, a fulcrum stud on said arm entering said hub, a needle-bar, alooper, a driving shaft journaled in the frame below said supporting armand formed with an axially movable looper-carrying section, a bushingembracing said looper-carrying shaft-section and slidingly movabletherewith, a rocker having a single fulcrum point on the frame andprovided with direct link connections with the needle-bar frame and thebushing, and a segment lever operatively connected with said shaft andprovided with an adjustable link connection with the rocker.

3. In a sewing machine, the combination with a frame including asupporting arm, a needle-bar frame provided with a fulcrum upon saidarm, a needle-bar and means for reciprocating the same, a sectionaldriving shaft journaled in the frame below the overhanging arm, the endof one section thereof being formed with a key to engage the opposedwalls of a slot formed in the other section, a looper carried by oneshaft-section, a sliding bushing surrounding and held against endwisemovement relative to said looper carrying shaft-section and forming asupporting bearing therefor, arocker, a link directly connecting saidrocker with the needle-bar frame above its fulcrum point, and a linkdirectly connecting the rocker with the said sliding bushing.

4. In a sewing machine, the combination with a frame including abed-plate and an arm overhanging the same, of a needle-bar frame mountedfor lateral movement on said arm, a looper, a driving shaft journaled inthe frame below the overhanging arm and formed with a sliding sectioncarrying the looper, means for simultaneously imparting axial movementto said sliding shaft-section and lateral movement to the needle-barframe, a feed-bar carrying a feed-dog, feed actuating and feed-liftrockers pivotally supporting said feed-bar, respectively at the rear andforward ends thereof, parallel bearing supports rising above thebed-plate and affording common supporting members for the feed-rockers,and reciprocatory actuating members connecting the driving shaft and thefeed-rockers intermediate said hearing supports.

5. In a sewing machine, the combination with a frame including asupporting arm, of a needle-bar frame mounted for lateral movement upon.said arm, a needle-bar, a looper having a rearward stud, a driving shaftjournaled in the frame and comprising a forward section formed at oneend with an annular flange and with an axial aperture to receive thelooper-stud, and at its opposite end formed with an axial aperture and atransverse channeled seat, a sleeve fitted upon the forward shaftsection and abutting the annular flange thereon, an intermediate shaftsection formed in one end with a slot and at its opposite end with atransverse lug and a projecting stud to fit the apertured channeled endof the forward shaft section and adapted to confine the sleeve thereon,a rear shaft section having a keyed end to enter the slot in theintermediate section, a rocker o eratively connected with the needle-barf i'ame and with the said sleeve, and an operative connection betweenthe driving, shaft and said rocker.

6. In a sewing machine, the combination with a frame including abedplate and an overhanging arm supported y an upright standard, aneedle-bar frame mounted for lateral movement upon the overhanging arm,a needle-bar and means to reciprocate the same, a looper, a drivingshaft including a looper-support slidingly mounted below' theoverhanging arm, a grooved cam-wheel operatively connected with thedriving shaft, a segment-lever mounted upon the standard and operativelyengaged'by said cam-wheel, a rocker comprising reversely movable armshaving a transverse axial support upon the standard adjacent thesegment-lever, an adjustable link connecting the rocker and lever, andlink connections between the rocker-arms, the, needle-bar frame and saidsliding looper-support.

7. In a sewing machine, the combination with a laterally vibratingneedle and means for actuating the same, a looper driving shaft, alooper carried thereby, a support, a bushing slidable in said supportand forming a bearing for said shaft, means for holding said shaftagainst endwise movement relative to said bushing, a throatplate securedto said bushing and movable therewith, and means for imparting endwisemovement to said bushing in unison with said laterally vibrating needle.

8. In a sewing machine, the combination with a frame, of a driving shaftjournaled therein and comprising a main section and an endwise movablelooper-carrying section coupled to rotate in unison, a looper mountedupon the latter, means for imparting axial movements to saidlooper-carrying shaft-section, a feed-bar disposed adjacent to saidlooper-carrying shaft-section and carrying a feed-dog, feed-actuatingand and independent operative connections between said rockers and said.main shaftsection. i

9. In a sewing machine, the combination with a frame, of alooper-driving shaft journaled therein and comprising a main sectionandan endwise movable section coupled to rotate in unison, a looperdriven from one of said sections, a bearing stud upon said frame, a cammounted on said stud for imparting to said looper axial movements, adriving connection between said looper driving shaft and said cam, andmeans for adjusting the relative pdsitions of-said looper-driving shaftand the camsustaining portion of said stud.

10. In a sewing machine, the combination with a frame, of alooper-driving shaft journaled therein and comprising a main section andan endwise movable section coupled to rotate in unison, a looper drivenfrom one of said sections, a bearing stud having an eccentric shankportion adjustably mounted in the frame, a cam mounted upon said studfor imparting axial movements to said looper, a driven gear secured tosaid cam, and a driving gear carried by said driving shaft and meshingwith said driven gear.

In testimony whereof, I have signed my name to this specification, inthe presence of two subscribing witnesses.

' ALFRED GEIEB.

Witnesses l t. LEE Hnmrs, H. A. KonNnMANN,

